AWS CloudFormation:在嵌套堆栈之间传递值

Question

更多AWS问题!好的,所以想法是一个主模板调用所有嵌套的堆栈.在这里的帮助下,我想出了如何将参数从master传递到嵌套堆栈.现在我试图弄清楚如何将值从嵌套堆栈传递到嵌套堆栈.我相信这应该通过出口和进口来完成,但我认为我没有这么做.我不确定这是我的进口或出口是错的.

我得到的错误是:

No export named TestStack1-VpcStackID found. Rollback requested by user.

主:

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "Master template",
    "Parameters" : {
        "availabilityZone" : {
            "Default" : "us-east-1d",
            "Description" : "Enter AvailabilityZone.",
            "Type" : "String"
        },
        "VpcCidrBlock" : {
            "Default" : "10.0.0.0/16",
            "Description" : "VPC CIDR Block.",
            "Type" : "String"
        },
        "PublicSubnetCidrBlock" : {
            "Default" : "10.0.0.0/24",
            "Description" : "Public subnet CIDR block.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "VpcStack" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
                "Parameters" : {
                    "VpcCidrBlock" : {
                        "Ref" : "VpcCidrBlock"
                    }
                },
                "TemplateURL" : "https://s3.amazonaws.com/url/templates/vpcStack.json",
                "TimeoutInMinutes" : "5"
            }
        },
        "PublicRouteStack" : {
            "Type" : "AWS::CloudFormation::Stack",
            "Properties" : {
                "Parameters" : {
                    "PublicSubnetCidrBlock" : {
                        "Ref" : "PublicSubnetCidrBlock"
                    },
                    "VpcStack" : {
                        "Fn::ImportValue" : {
                            "Fn::Sub" : "${AWS::StackName}-VpcStackID"
                        }
                    }
                },
                "TemplateURL" : "https://s3.amazonaws.com/url/templates/publicRouteStack.json",
                "TimeoutInMinutes" : "5"
            }
        }
    }
}

VpcStack(嵌套 - 我不认为我输出正确):

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "VPC template",
    "Parameters" : {
        "VpcCidrBlock" : {
            "Description" : "Vpc CIDR Block.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "VpcStack" : {
            "Type" : "AWS::EC2::VPC",
            "Properties" : {
                "EnableDnsSupport" : "true",
                "EnableDnsHostnames" : "true",
                "CidrBlock" : {
                    "Ref" : "VpcCidrBlock"
                },
                "Tags" : [
                    {
                        "Key" : "Application",
                        "Value" : {
                            "Ref" : "AWS::StackName"
                        }
                    }
                ]
            }
        }
    },
    "Outputs" : {
        "VpcStack" : {
            "Description" : "VPC Stack ID.",
            "Value" : {
                "Ref" : "VpcStack"
            },
            "Export" : {
                "Name" : {
                    "Fn::Sub" : "${AWS::StackName}-VpcStackID"
                }
            }
        }
    }
}

PublicStubnetStack(我认为这是它失败的地方):

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Description" : "Public Subnet Stack",
    "Parameters" : {
        "PublicSubnetCidrBlock" : {
            "Default" : "10.0.0.0/24",
            "Description" : "Public subnet CIDR block.",
            "Type" : "String"
        },
        "VpcStack" : {
            "Description" : "VPC Stack.",
            "Type" : "String"
        }
    },
    "Resources" : {
        "PublicSubnet" : {
            "Type" : "AWS::EC2::Subnet",
            "Properties" : {
                "VpcId" : {
                    "Ref" : "VpcStack"
                },
                "CidrBlock" : {
                    "Ref" : "PublicSubnetCidrBlock"
                },
                "Tags" : [
                    {
                        "Key" : "Application",
                        "Value" : {
                            "Ref" : "AWS::StackName"
                        }
                    },
                    {
                        " Key" : "Network",
                        "Value" : "Public"
                    }
                ]
            }
        }
    },
    "Outputs" : {
        "PublicSubnet" : {
            "Description" : "Public Subnet ID.",
            "Value" : {
                "Ref" : "PublicSubnet"
            },
            "Export" : {
                "Name" : {
                    "Fn::Sub" : "${AWS::StackName}-PublicSubnetID"
                }
            }
        }
    }
}

很抱歉发布这么多,我是AWS的新手,我正在尝试快速提取它.

Answer 1

问题

您的问题是您将值导出为

"Export" : {
  "Name" : {
    "Fn::Sub" : "${AWS::StackName}-VpcStackID"
  }
}

您正在使用${AWS::StackName}将当前堆栈名称替换为导出变量名称的变量.请注意,这是嵌套堆栈的堆栈名称.

然而,在您的包装器模板中,您尝试将值导入为:

"Fn::ImportValue" : {
  "Fn::Sub" : "${AWS::StackName}-VpcStackID"
}

再次,您将该变量替换${AWS::StackName}为当前堆栈,在本例中是您的包装器堆栈.

请注意,当您使用嵌套堆栈时,实际上是在创建一个新堆栈,因此堆栈名称会根据您所在的模板而更改.

决议

不要对您的变量使用导入/导出.

在嵌套模板中,Export从输出中删除元素.你不需要它们.只需使用堆栈参数将值从包装器堆栈传递到嵌套堆栈,并使用堆栈输出将值从嵌套堆栈传递回包装器堆栈.

在你的包装器堆栈中,使用如下输出VpcStack:

"PublicRouteStack" : {
        "Type" : "AWS::CloudFormation::Stack",
        "Properties" : {
            "Parameters" : {
                "PublicSubnetCidrBlock" : {
                    "Ref" : "PublicSubnetCidrBlock"
                },
                "VpcStack" : {
                    "Fn::GetAtt" : [ "VpcStack", "Outputs.VpcStack" ]
                }
            },
            "TemplateURL" : "https://s3.amazonaws.com/url/templates/publicRouteStack.json",
            "TimeoutInMinutes" : "5"
        }
    }

请注意,在这种情况下,我使用的输出命名VpcStack您VpcStack通过嵌套堆栈Fn::GetAtt功能.

PS.为了清楚起见,您应该更改一些名称.尽量避免在整个地方重复使用相同的名称.它有助于使事情变得清晰.